optimization problem exceeding high limit

rtx=2;
objective= @(a) a;
options=optimoptions('fmincon', 'Display','iter','MaxFunctionEvaluations',30000);
a0=0.8;
A = [];
b = []; 
Aeq = []; 
beq = [];
lb=0.5; 
ub=1; 
nonlincon=@nl2 ; 
a=fmincon(objective,a0,A,b,Aeq,beq,lb,ub,nonlincon,options)

fmincon stopped because it exceeded the function evaluation limit,
options.MaxFunctionEvaluations = 3.000000e+04.

i have the following optimization probelm and the result is as follows. i tried to inrease the MaxFunctionEvaluation and decrease StepTolerance but it always exceed the limit. Any ideas how to fix such problem to obtain an optimal value?

Answer 1

[Chidvi Modala]

As nl2 function definition is not known I am unable to reproduce the error. With the provided information, Setting lower bond equal to upper bound might be causing the error.

If you set a lower bound equal to an upper bound, iterations can violate constraints. You can refer to this